Commitments and Contingencies - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Mar. 31, 2012
Commitments and Contingencies Disclosure [Line Items]
Fair value of contingent liability	$ 7,043	$ 8,213
Contractual non-compliance liabilities incurred by Simena	565	700
Simena LLC
Commitments and Contingencies Disclosure [Line Items]
Fair value of contingent liability	8,000
Contractual non-compliance liabilities incurred by Simena	1,600
Present Value of Future Consideration \| Simena LLC
Commitments and Contingencies Disclosure [Line Items]
Fair value of contingent liability	7,000
Contractual non-compliance liabilities incurred by Simena	$ 565

Fair value, as of the acquisition date, of potential payments under the contingent consideration arrangement including cash and shares.

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+ Details